The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 2021
Filed:
Dec. 19, 2018
Sumitomo Chemical Company, Limited, Tokyo, JP;
Ichiro Arise, Osaka, JP;
Toshihiko Ogata, Osaka, JP;
Chikae Yoshimaru, Osaka, JP;
Chikara Murakami, Osaka, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Abstract
A nonaqueous electrolyte secondary battery which satisfies four requirements is provided. A porous layer contains α-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol % with respect to 100 mol % of a total amount of (i) the α-form polyvinylidene fluoride-based resin and (ii) β-form polyvinylidene fluoride-based resin. A porous film has a temperature rise ending period of 2.9 sec·m/g to 5.7 sec·m/g with respect to an amount of a resin per unit area when the porous film is impregnated with N-methylpyrrolidone containing water in an amount of 3% by weight and then (ii) irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz. A positive electrode plate has a capacitance of 1 nF to 1000 nF per measurement area of 900 mm. A negative electrode plate has a capacitance of 4 nF to 8500 nF per measurement area of 900 mm.